1A, 4.5V to 40V Input Buck Converters with
50mA Auxiliary LDO Regulators
ELECTRICAL CHARACTERISTICS (continued)
(V IN_SW = V IN_LDO = V DRAIN = 14V, V EN_SYS = V EN_SW = 2.4V, V REG = V DVREG , V SYNC = V SET_LDO = V SGND = V PGND = 0V, C REG =
1μF, C IN_SW = 0.1μF, C IN_LDO = 0.1μF, C LDO_OUT = 10μF, C DRAIN = 0.22μF, T A = T J = -40°C to +125°C, unless otherwise noted.
Typical values are at T A = +25°C.) (Note 1)
PARAMETER
SYNC Frequency Range
SYMBOL
f SYNC
CONDITIONS
MAX15014/MAX15016
MAX15015/MAX15017
MIN
100
400
TYP
MAX
200
600
UNITS
kHz
Ramp Level Shift (Valley)
ERROR AMPLIFER
0.3
V
Soft-Start Reference Voltage
V SS
1.210
1.235
1.260
V
Soft-Start Current
FB Regulation Voltage
FB Input Range
FB Input Current
COMP Voltage Range
I SS
V FB
V FB
I FB
V SS = 0V
V FB = 1.244V
I COMP = -500μA to +500μA
7
1.210
0
-250
0.25
12
1.235
17
1.260
1.5
+250
4.5
μA
V
V
nA
V
Open-Loop Gain
Unity-Gain Bandwidth
80
1.8
dB
MHz
PWM Modulator Gain
f SYNC = 500kHz, MAX15015/MAX15017
f SYNC = 135kHz, MAX15014/MAX15016
10
10
V/V
CURRENT-LIMIT COMPARATOR
Pulse Skip Threshold
Cycle-by-Cycle Current Limit
IPFM
I ILIM
100
1.3
200
2
300
2.6
mA
A
Number of Consecutive ILIM
Events to Hiccup
Hiccup Timeout
POWER SWITCH
7
512
Clock
periods
Switch On-Resistance
V BST - V LX = 6V
0.15
0.4
0.80
?
Switch Gate Charge
Switch Leakage Current
V BST - V LX = 6V
V IN_SW = V IN_LDO = V LX = V DRAIN =
40V, V FB = 0V
4
10
nC
μA
BST Quiescent Current
BST Leakage Current
V BST = 40V, V DRAIN = 40V, V FB = 0V,
DVREG = 5V
V BST = V DRAIN = V LX = V IN_SW =
V IN_LDO = 40V, EN_SW = 0V
400
600
1
μA
μA
CHARGE PUMP (MAX15015/MAX15016)
C- Output Voltage Low
C- Output Voltage High
DVREG to C+ On-Resistance
LX to PGND On-Resistance
Sinking 10mA
Relative to DVREG, sourcing 10mA
Sourcing 10mA
Sinking 10mA
0.1
0.1
10
12
V
V
?
?
LDO
Input Voltage Range
V IN_LDO
5
40
V
Undervoltage Lockout Threshold
UVLO_LDO TH
V IN_LDO rising
3.90
4.1
4.25
V
Undervoltage Lockout Hysteresis
UVLO_LDO HYST
0.3
V
4
_______________________________________________________________________________________
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MAX15017AATX+T 功能描述:直流/直流开关转换器 1A 4.5-40V Input Buck Converters RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT
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